Sum of the integer part of 5/2-th roots of integers less than or equal to n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =7a(7) =9a(8) =11a(9) =13a(10) =15a(11) =17a(12) =19a(13) =21a(14) =23a(15) =25a(16) =28a(17) =31a(18) =34a(19) =37a(20) =40a(21) =43a(22) =46a(23) =49a(24) =52a(25) =55a(26) =58a(27) =61a(28) =64a(29) =67